Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e4b7d63374fe90…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 17:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ecd0083049ff2e74ee28459bdb13f504 SHA-1: 1bafdb80fbcb7e7fcd96633e95588e6b65973519 SHA-256: e5e4b7d63374fe90b1afdc7f6835a7607f0cff57166a99010ae65e18a24d76f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=under+10+mb+games PDF link annotation
    • https://portalbime.com/UploadedFiles/New/file/vuduwopevekuzalojavurig.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/kidubafevipomapex.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/zujesiralatoraren.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/16148864858.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/bavuvivetusitewaxisulu.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/76273762086.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/paxojikerupovobezuvufavup.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/75700042421.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/jenibiniwozewekujix.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/vateranugelowu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/30650246417.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/17894216715.pdfIn PDF document text
    • http://szhlfz.net/upload/19829225533.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/34022229208.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nuremitesotogugetuben.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/43418259166.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/7546464066.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/kekate.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161494ca548c33---kafuninorusivixegikuzata.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/94060283482.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/42871260305.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pozegarovaxolifisepufot.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/92694614577.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/34994616615.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/68397525085.pdfIn PDF document text
    • https://bagstyle.uz/images/file/nedumegikaxiwidanu.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/vopabotokenenegerugofumo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 17440 bytes
SHA-256: 56c0e4c9d9ac1b1b7ac67991f555532d89d1ec01f0b151bb595b8db73c7bff6a
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 10556 bytes
SHA-256: 3625c2f0813d2c4c886e51754f7144c78437648ea38b50cf0cf0d6808c952b8f